Fishamn, thanks for all the info. I'm with you on ease of use. I agree, that is why I use and sell water soluble I can simply cast in to the pond. The SE website says 1-5 acres per bucket, which is it??? If you and/or others could comment on how many acres they put out /acre.
Let's say it treats 2.5 acres per bucket and cost $30 it would be $12/acre. Environmnetal conditions would dictate how many times you have to add. This compares to water soluble Thrive fertilizer at $30 for 25lb box. It will treat 6 acres so only $5/acre/appl.
I guess this is the point I have been trying (so hard)to figure out. I will use the water soluble b/c easier and less money. I'm not saying anything bad about the SE and realize it is even easier and have several other advantages I just don't see how it is possibly less money than water soluble powder. whew